/*
 * Batch Download API List
 * /batchDownload/manage/list - GET
 * /batchDownload/manage/config - POST 创建新配置
 * /batchDownload/manage/description/{id} - POST 更新任务说明
 * /batchDownload/manage/owner/{id} - POST 设置owner
 * /batchDownload/manage/config/{id} - DELETE 删除配置
 * /batchDownload/data/{id} - GET 获取指定ID的数据包下载地址
 * /batchDownload/manage/path - GET 获取指定ID的文件目录结构
 * /batchDownload/manage/fileTree - GET 获取指定文件的目录结构
 * /batchDownload/manage/fileDownload - GET 下载指定文件
 */
package controllers

import (
	"bufio"
	"fmt"
	"fwh-toolbox-server/domain"
	"fwh-toolbox-server/services"
	"fwh-toolbox-server/utils/mimetype"
	"path"
	"strconv"
	"strings"

	"github.com/gofiber/fiber/v2"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.uber.org/zap"
)

// 获取批量数据下载管理表
// /batchDownload/manage/list
func GetBatchDownloadList(c *fiber.Ctx) error {
	pageInt, _ := strconv.Atoi(c.Query("pageNum", "1"))
	sizeInt, _ := strconv.Atoi(c.Query("pageSize", "20"))

	if pageInt <= 0 || sizeInt <= 0 {
		return Fail(c, "Invalid request para")
	}

	sn := c.Query("sn", "")
	progress := c.Query("progress", "")

	var p_sn *string = nil
	if sn != "" {
		p_sn = &sn
	}

	var p_progress *string = nil
	if progress != "" {
		p_progress = &progress
	}

	listPage, err := services.GetBatchDownloadManageList(uint(pageInt), uint(sizeInt), p_sn, p_progress)
	if err != nil {
		zap.L().Warn("Database read failed. (MongoDb)", zap.String("err", err.Error()))
		return Error(c, "Database read failed. (MongoDb)")
	}
	return Success(c, listPage)
}

// 创建一个批量数据下载管任务
// /batchDownload/manage/config
func CreateBatchDownload(c *fiber.Ctx) error {
	var body domain.BatchDownloadConfigWrite
	if err := c.BodyParser(&body); err != nil {
		zap.L().Warn("Invalid request body", zap.String("err", err.Error()))
		return Fail(c, "Invalid request body")
	}

	if err := services.InsertBatchDownloadConfig(body); err != nil {
		zap.L().Warn("Database write failed. (MongoDb)", zap.String("err", err.Error()))
		return Error(c, "Database write failed. (MongoDb)")
	}
	return Success(c, body)
}

// 更新一个批量数据下载说明
// /batchDownload/manage/description/:id
func UpdateBatchDownloadDescription(c *fiber.Ctx) error {
	id := c.Params("id")
	var body string
	if err := c.BodyParser(&body); err != nil {
		zap.L().Warn("Invalid request body", zap.String("err", err.Error()))
		return Fail(c, "Invalid request body")
	}

	objID, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		zap.L().Warn("Invalid request para :id", zap.String("err", err.Error()))
		return Fail(c, "Invalid request para :id")
	}

	if err := services.UpdateBatchDownloadDescription(objID, body); err != nil {
		zap.L().Warn("Database write failed. (MongoDb)", zap.String("err", err.Error()))
		return Error(c, "Database write failed. (MongoDb)")
	}
	return Success(c, body)
}

// 设置一个批量数据的owner
// /batchDownload/manage/owner/:id
func UpdateBatchDownloadOwner(c *fiber.Ctx) error {
	id := c.Params("id")
	var body struct {
		Owner []string `json:"owner"`
	}
	if err := c.BodyParser(&body); err != nil {
		zap.L().Warn("Invalid request body", zap.String("err", err.Error()))
		return Fail(c, "Invalid request body")
	}

	objID, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		zap.L().Warn("Invalid request para :id", zap.String("err", err.Error()))
		return Fail(c, "Invalid request para :id")
	}

	if err := services.UpdateBatchDownloadOwner(objID, body.Owner); err != nil {
		zap.L().Warn("Database write failed. (MongoDb)", zap.String("err", err.Error()))
		return Error(c, "Database write failed. (MongoDb)")
	}
	return Success(c, body)
}

// 删除一个批量数据下载数据
// /batchDownload/manage/config/:id
func DeleteBatchDownload(c *fiber.Ctx) error {
	id := c.Params("id")

	objID, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		zap.L().Warn("Invalid request para :id", zap.String("err", err.Error()))
		return Fail(c, "Invalid request para :id")
	}

	err = services.DeleteBatchDownloadConfig(objID)
	if err != nil {
		zap.L().Warn("Database delete failed. (MongoDb)", zap.String("err", err.Error()))
		return Error(c, "Database delete failed. (MongoDb)")
	}
	return NoContent(c)
}

// 获取指定ID的批量数据下载数据包地址
// /batchDownload/data/:id
func GetBatchDownloadData(c *fiber.Ctx) error {
	id := c.Params("id")

	objID, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		zap.L().Warn("Invalid request para :id", zap.String("err", err.Error()))
		return Fail(c, "Invalid request para :id")
	}

	c.Set("Content-Type", "application/zip")
	c.Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"BatchDownload_%s.zip\"", id))

	// Fiber 原生 Context 的 BodyWriter，可直接写数据到 HTTP 输出
	// writer := c.Context().Response.BodyWriter()

	// 使用 SetBodyStreamWriter 流式写入
	c.Context().SetBodyStreamWriter(func(w *bufio.Writer) {
		err = services.GetBatchDownloadData(objID, w)
		if err != nil {
			zap.L().Warn("Database read failed. (MongoDb)", zap.String("err", err.Error()))
			return
		}
		w.Flush()
		fmt.Println("SetBodyStreamWriter complete.")
	})

	return nil
}

// 获取指定ID的文件目录结构
// /batchDownload/manage/path
func GetBatchDownloadPath(c *fiber.Ctx) error {
	id := c.Query("id", "")

	objID, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		zap.L().Warn("Invalid request para :id", zap.String("err", err.Error()))
		return Fail(c, "Invalid request para :id")
	}

	pathInfo, err := services.GetBatchDownloadPath(objID)
	if err != nil {
		zap.L().Warn("Path query failed.", zap.String("err", err.Error()))
		return Error(c, "Path query failed.")
	}
	return Success(c, pathInfo)
}

// 获取指定文件的目录结构
// /batchDownload/manage/fileTree
func GetBatchDownloadFileTree(c *fiber.Ctx) error {
	filePath := c.Query("file", "")

	pathInfo, err := services.GetBatchDownloadFileTree(filePath)
	if err != nil {
		zap.L().Warn("File tree query failed.", zap.String("err", err.Error()))
		return Error(c, "File tree query failed.")
	}
	return Success(c, pathInfo)
}

// 下载指定文件
// /batchDownload/manage/fileDownload
func GetBatchDownloadFileDownload(c *fiber.Ctx) error {
	filePath := c.Query("file", "")
	innerPath := c.Query("inner", "")

	var fileName string
	if innerPath == "" {
		fileName = path.Base(filePath)
	} else {
		if !strings.HasSuffix(filePath, ".tar.gz") {
			return Error(c, "File path suffix not is \".tar.gz\".")
		}
		fileName = path.Base(innerPath)
	}

	if fileName == "." {
		return Error(c, "File path is empty.")
	} else if fileName == "/" {
		return Error(c, "File path consists entirely of slashes.")
	}

	c.Set("Content-Type", mimetype.GetContentType(fileName))
	c.Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", fileName))

	// Fiber 原生 Context 的 BodyWriter，可直接写数据到 HTTP 输出
	// writer := c.Context().Response.BodyWriter()

	// 使用 SetBodyStreamWriter 流式写入
	c.Context().SetBodyStreamWriter(func(w *bufio.Writer) {
		err := services.GetBatchDownloadFileDownload(filePath, innerPath, w)
		if err != nil {
			zap.L().Warn("File read failed.", zap.String("err", err.Error()))
			return
		}
		w.Flush()
		fmt.Println("SetBodyStreamWriter complete.")
	})

	return nil
}